[amp_mcq option1=”a few free electrons and holes” option2=”many holes” option3=”many free electrons” option4=”No holes E. None of the above” correct=”option1″]
The correct answer is A. a few free electrons and holes.
An intrinsic semiconductor is a semiconductor in its purest form, with no intentional doping of impurities. The number of free electrons and holes is equal at room temperature. This is because the thermal energy at room temperature is enough to excite some electrons from the valence band to the conduction band, leaving behind an equal number of holes in the valence band.
Option B is incorrect because it states that there are many holes. This is not true, as the number of holes is equal to the number of free electrons.
Option C is incorrect because it states that there are many free electrons. This is not true, as the number of free electrons is equal to the number of holes.
Option D is incorrect because it states that there are no holes. This is not true, as there are always some holes in the valence band of an intrinsic semiconductor.
Option E is incorrect because it states that none of the above is true. This is not true, as option A is the correct answer.